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COMPENSATION PLANS - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 17, 2017
USD ($)
tranche
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred compensation obligations, period after retirement for benefits   15 months      
Assumed discount rate     4.50%    
Administrative expense | $   $ 19.8 $ 0.1    
Share-based compensation expense | $   $ 15.4 $ 14.0 $ 10.4  
Granted during the year (in dollars per share) | $ / shares   $ 0 $ 0 $ 53.83  
Granted during the year (in shares) | shares   0 0 340,000  
Share price (in dollars per share) | $ / shares   $ 52.43 $ 29.61 $ 69.45  
Proceeds from stock options exercised | $     $ 0.9    
Tax benefit realized from stock options exercised | $     0.9    
Options vested (in shares) | $   $ 5.8 $ 5.8 $ 1.2  
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense | $   $ 1.9      
Vesting period   12 months 6 days      
Granted during the year (in shares) | shares   0 0    
Employee Stock Option | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Contractual term   9 years      
Employee Stock Option | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   4 years      
Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense | $   $ 1.6      
Vesting period 4 years 12 months 9 days      
Granted during the year (in dollars per share) | $ / shares   $ 0 $ 0 $ 63.85  
Granted during the year (in shares) | shares   0 0 340,000  
Granted during the year (in shares) | shares         85,032
Grate date fair value of awards vested | $ $ 5.0        
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense | $   $ 16.3      
Granted during the year (in shares) | shares   0 0    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost not yet recognized, period for recognition   15 months 21 days      
Granted during the year (in shares) | shares   378,000 182,000 233,000  
Granted during the year (in dollars per share) | $ / shares   $ 39.74 $ 65.35 $ 54.46  
Restricted Stock | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   1 year      
Restricted Stock | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   5 years      
Time-based cliff vesting | Restricted Stock | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   1 year      
Time-based cliff vesting | Restricted Stock | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Strike Price, Tranche One | Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share price (in dollars per share) | $ / shares $ 53.83        
Strike Price, Tranche Two | Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share price (in dollars per share) | $ / shares 60.03        
Strike Price, Tranche Three | Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share price (in dollars per share) | $ / shares 66.93        
Strike Price, Tranche Four | Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share price (in dollars per share) | $ / shares $ 74.63        
The 2009 Plan | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 4 years        
Contractual term 9 years        
Shares approved (in shares) | shares 340,110        
Granted during the year (in dollars per share) | $ / shares $ 53.83        
The 2009 Plan | Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 4 years        
Contractual term 9 years        
Shares approved (in shares) | shares 340,128        
Number of tranches granted | tranche 4